Lathe-dog.



R. H. WEST.

LATHE DOG. APPLICATION FILED 0OT.16, 1911.

Patented July 16,1912.

@mmw 1 M/W RALlI-I H. WEST, OF CLEVELAND, OHIO.

LATHE-DOG.

Specification of- Letters Patent.

Application filed October 16, 1911.

Patented July 16, 1912. Serial No. 654,881.

To an whom it may concern."

-Be it known that I, RALPH H. Wnsr, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Lathe-Dogs, of which the following is a full,-clear, and

exact description.

'of personal injury.

The present invention relates to lathe-dogs and has for its principal object to provide a-practical and commercially successful form of dog, which is inexpensive to manufacture, and which has a guard for the set screw arranged so as to eliminate or at least mini.- mize the danger of the screw catching or being entangled in the workmans clothing.

Still further, the invention aims to provide on the dog a set screw guard and to accomplish this by means of a construction which materially strengthens the dog and facilitates the handling or adjusting. of the dog and at the same time reduces the liability of injury to the hands or fingers of the workman.

The above and other objects are accomplished by my invention, which may be briefly summarized as consisting of certain novel details of construction and arrangements of parts which will be described in the specification and set forth in the appended claims.

In the drawings wherein I have shown two slightly different forms of my invention, Figure 1 is a face view of my improved lathe dog; Fig. 2 is a side View of the same; Fig. 3 is a top plan view; Fig. 4 is a side view of a dog slightly modified in form; and Fig. 5 is a top plan view of a dog shown in Fig. 4. j

Referring now to the drawing, it will be seen that the dog includes a body 10 which has an opening 10 for the work, a tail or tail piece 11, which may or bent type, as shown, or may be straight, and diametrically opposite the tail. :1 boss 12- having a threaded opening for a set screw to and long the tail piece.

. tremity of the tail.

above the boss and be of the angular 13 for fastening or clamping the dog to the work.

The ordinary form of lathe dog consists of these arts alone, a portion of the set screw project-ing outwardly beyond the boss in a manner such that the head of the screw which is usually rough and irregular in shape can and often does catch in the clothing of the workman.

.For the attainment of the objects previouslymentioned, the body 10 of the dog is provided with an external flange or rib 1 1 which extends centrally about the body down Considering the part of the dog having the boss and-set screw as the upperpart, it will be'seen that this flange 14 pxtends outwardly from the body a greater distance at the top than at the sides, the periphery of the upper part of the flange being nearly semi-circular with the curve struck from a center somewhat above'the axis of rotation of the dog. At its extremity, opposite the boss, the flange is about the same or at a less distance from the axis of rotation of the dog thanthc ex- This flange has a portion- 14 which bridges or extends over the boss and forms an integral arched guard for the set screw 13, the part directly opposite the boss and set screw being flat and in the form of a ring 14'. having an opening 14", concentric with the threaded opening for the set screw. Between this bridging portion and the boss there is provided an open ing 14 the bottom of which-is flush with the top of the boss' and which extends laterally outward toward the periphery of the flange on both sides of the boss, thus forming between the bridging portion 14 and the boss a sector shaped open space for the manipulation of a wrench employed for adjusting the set screw. Inasmuch as the flange 14 is quite thin, as shown in the side and plan news, the permissible throw of the wrenci is only slightly less than 180.

he opening-14 in the ring 14 directly set screw opening, is primarily for the purpose of permitting the insertion of the set screw through the guard and into the threaded opening, thus doing away with the necessity of having the space between the guard and the boss of sufficient height to permitthe insertion of the set screw laterally between these parts. This opening 14 is preferably sufficiently largie to permit the insertion and manipulation of set screw when the head thereof is directly the dog may be easily I jaw wrench.

in the construction first describet.

handling and the adjusting'of the dog with in the ring li and not accessible either above or below the same with an ordinary Below the opening 1e and on opposite sides of the boss'and body 10, openings 14 are formed, the purpose of which is not only to lighten the dog and toeffect a saving in metal, but the principal object of these openings 14* is to facilitate? the handling and adjustment of a dog, particularly when the dog is being fastened to the work and connected to the face plate of the lathe. Ordinarily, when a workman shifts the dog along the work before the'set screw is tastened, and inserts the tail piece in the slot of the face plate, he usually shiftsthe dog by grasping the same at'the tail, and in so doing, it is often the case that his fingers or hands are injured. However, the openings 14 form handles or hand holds by which turned on the work and moved lengthwise thereof to insert or remove the tail piece from the face plate, without any danger of personal injury.

In Figs. 5 and 6 I have shown a slight modification wherein the flange, here designated 15, has its upper portion 15, which constitutes the ,bridging guard, somewhat offset to one side of the center plane of the body of the guard, thereby permitting the wrench used in adjusting the screw to have a longer throw. In this case, the wrench may be moved fully 1% in either direction.

Even though the upper portion is offset, as clearly shown in the drawing, the ring 15 having the opening through which the screws may be inserted is directly above and in alinement with the boss and set screw, as It will therefore be seen that the integral guard which I have provided will serve very effectually for the purpose intended and at the same time is embodied with parts which are so arranged with respect to the bodyof the dog as to materially strengthen the same. At the same time, the dog is not greatly increased in weight, nor is the increase in expense over that of an ordinary dog a matter of any importance. Additionally, as before stated, these parts so permit the less liability of injury than heretofore.

I do not desire to be confined tothe exact details shown, but aim in my claims to cover all modifications which do not involve a departure from the spirit and scope of my invention.

Having thus described my what I claim is:

1 1. A lathe dog comprising a body having an opening for the work, atail piece, and a threaded opening for a set screw at substantially right angles to the opening for the work, said body being provided with an integralset screw overlies the set screw opening, there being invention,

guard which bridges and between the body and guard a space for the manipulation'of a wrench. s v

2. A lathe dog comprisinga body having a tail piece, an opening for the work, and a threaded opening for a set screw arranged at substantially right angles to the opening for thework, a guard integral with the body and bridging the set screw opening, said guard having in alinement with the thread,- ed set screw opening an opening for the in sertion of the set screw through the guard, and there being between the body and guard a space for the manipulation of a wrench.

3. it lathe dog comprising a body having an opening for the work and provided with a tail piece and a threaded opening for a set screw, and said body having an external integral flange, a portion of the'rfiange bridging the opening for the set screw and constituting a guard, said guard having an opening through the guard, and there being between the guard manipulation of a wrench.

4:. A lathe dog comprising a body having an opening for the work and provided with a tail piece and with a threaded opening tor a set screw, said body having a narrow flange extending about of the flange opposite the threaded opening forming a guard for a set screw and having centrally in said portion a laterally enlarged fiat portion provided with an opening for the insertion of the set screw through the guard, there'being between the-guard and the body, an open space for the manipulation of a wrench for adjusting the set screw.

In .testimony whereof, I hereunto attix my signature in the presence of two witnesses.

RALPH H. WEST.

the same, the portion \Vitnessesi H. R. SULLIVAN, A. F. Kwis.

and body an opening for the' 

